diff --git a/src/vim9script.c b/src/vim9script.c
index 4d16a2a..e5e2695 100644
--- a/src/vim9script.c
+++ b/src/vim9script.c
@@ -115,6 +115,7 @@
 #endif
 }
 
+#if defined(FEAT_EVAL) || defined(PROTO)
 /*
  * When in Vim9 script give an error and return FAIL.
  */
@@ -159,6 +160,7 @@
     }
     return FALSE;
 }
+#endif
 
 /*
  * Return TRUE if "p" points at a "#" not followed by one '{'.